GitHub's public timeline
summarizes the open source work of millions of developers the world
over.
This data set contains contributions to the top 200 GitHub repositories
during the first four months of 2013 and plots the location based
on what the contributor provided.
Some projects like Django have contributors from all over the globe
Other like XBMC are mostly represented by a single continent
Linux has a lot of forks for a project that doesn't accept pull requests